title: Phase-locking of oscillating images using laser-induced spin-polarized pulse TEM.
abstract: Pulse-mode operation was realized in spin-polarized transmission electron microscopy (SP-TEM) using a laser-driven electron gun with a GaAs-GaAsP strained-layer-superlattice photocathode. TEM images were acquired with a pulsed electron beam with a 5-μs pulse duration. Phase locking of wobbling TEM images was demonstrated using a pulsed beam with a 1-kHz repetition frequency, which matched the image wobbling frequency. It was found that in composite images formed by superimposing 2 × 10(4) separate single-pulse exposures, the amount of image blurring due to wobbling was a linear function of the pulse duration. These results suggest the possibility of pump-probe measurements in SP-TEM using the pulsed electron beam as a probe, allowing nanometer-scale time-resolved spin mapping.
authors.affiliation: Department of Engineering, Nagoya University, Furo-cho, Nagoya, Aichi 464-8603, Japan.
authors.forename: Makoto
authors.initials: M
authors.lastname: Kuwahara
authors.forename: Yoshito
authors.initials: Y
authors.lastname: Nambo
authors.forename: Soichiro
authors.initials: S
authors.lastname: Kusunoki
authors.forename: Xiuguang
authors.initials: X
authors.lastname: Jin
authors.forename: Koh
authors.initials: K
authors.lastname: Saitoh
authors.forename: Hidefumi
authors.initials: H
authors.lastname: Asano
authors.forename: Toru
authors.initials: T
authors.lastname: Ujihara
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Takeda
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Nakanishi
authors.forename: Nobuo
authors.initials: N
authors.lastname: Tanaka
keywords: phase-lock; photocathode; pulse; spin; temporal resolved measurement; transmission electron microscopy